save project

sb.py

 username = "python"
 userpassword = "123456"
-
-
-a=input("请你输入账号：")
-b=input("请你输入密码：")
-
-if username==a and userpassword==b:
+while True:
+    name=input("请你输入账号：")
+    password=input("请你输入密码：")
+    if name == username and password==userpassword:
         print("登陆成功")
+        break
+    print("用户名和密码错误!请重新输入")
+print("欢迎来到巴黎圣母院!")
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